/* 做样式初始化的事情 */
body, button, form, h1, h2, h3, h4, h5, h6, hr, input,  li, p, pre, td, textarea, th, ul {
    margin: 0;
    padding: 0;
}
*{
    box-sizing: border-box;
}
a{
    text-decoration: none;
}
li{
    list-style: none;
}
/* img,input{
    display: block;
}

img{
    border: 0;
} */

input{
    outline: none;
}